The Dogma metalanguage: <a href="https://dogma-lang.org/" rel="nofollow">https://dogma-lang.org/</a><p>Because BNF-style metalanguages have stagnated over the decades, and can't describe binary structures.
A weather site that shows yesterday's weather:
<a href="https://weather.bingo/901846663/41061/threeday/f" rel="nofollow">https://weather.bingo/901846663/41061/threeday/f</a><p>A (Windows-only) very fast disk-space analysis tool.
<a href="https://github.com/jasonthorsness/jt-canhasfreespace">https://github.com/jasonthorsness/jt-canhasfreespace</a><p>both I think I am the only user, but both I keep using :P
a scientific paper reader/organizer <a href="https://youtu.be/uU_WeER2PSs" rel="nofollow">https://youtu.be/uU_WeER2PSs</a>
A simple brainstorming tool for coming up with mini project ideas <a href="https://brainstorm.gg" rel="nofollow">https://brainstorm.gg</a>